I promised i'd come back after i got my tummy tuck quote so here i am.
Obviously prices change depending on where you go etc but i was quoted around $10 000 for a full price tummy tuck. 'Luckily' my belly is bad enough that my tummy tuck is considered medical and not cosmetic which brings the price down due to medicare rebates. Also private health can bring the price down significantly if you are covered for plastic and reconstructive surgery (i don't think it covers it if your surgery is considered cosmetic though).
All up it is going to cost me around $4000-$5000 for a full tummy tuck and muscle repair.
I could recommend getting a quote as that is the only way you can get a proper idea of what it would cost.